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Signal Signal for iOS_GHSL-2026-113: Cross-thread authorization flaws allow unauthorized pin changes and poll votes in Signal for iOS

Risk 40

Any registered Signal user can unpin a message in any group on the recipient's device, corrupt that group's pin record, or cast a vote in a poll in a group they are not a member of.

First published (updated )
Advisory
GHSL-2026-112

Signal Signal for iOSGHSL-2026-112_GHSL-2026-113: Cross-thread authorization flaws allow unauthorized pin changes and poll votes in Signal for iOS

Risk 41

Any registered Signal user can unpin a message in any group on the recipient's device, corrupt that group's pin record, or cast a vote in a poll in a group they are not a member of.

First published (updated )
Advisory
GHSL-2026-113

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