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Back to active CVEs
Critical · CVSS 9.3CVE-2026-117656

Unverified Sign in with Apple callback parameter can override verified ID token claimsCVE-2026-117656

Answer in brief

CVE-2026-117656 records a Critical severity (CVSS 9.3) vulnerability in Unverified Sign in with Apple callback parameter can override verified ID token claims. The current sources do not mark it as known exploited. The current feed maps pow-auth/assent (generic), pow-auth/pow-auth/assent (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 30, 2026Updated Oct 30, 2026Source checked Oct 31, 2026First seen by HOL Oct 31, 2026Material review Oct 30, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.3
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps pow-auth/assent (generic), pow-auth/pow-auth/assent (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
pow-auth/assentgeneric>=0.1.25 <0.3.20.3.2
pow-auth/pow-auth/assentgeneric>=a2d331e8c51376d6c0b04a81aad31e0b4d4d64a3 <18898bde0296152165ae470078490e5798329b1b18898bde0296152165ae470078490e5798329b1b

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for pow-auth/assent, pow-auth/pow-auth/assent.
  2. 2Review the reported fix. Source-reported workaround: Remove the user parameter from the callback parameters before you pass them to Assent.Strategy.Apple.callback/2, for example with Map.delete(params, "user"). Without the parameter, decode_user_params/2 yields an empty map and the verified ID token claims pass through unchanged. The user's name is then unavailable, because Apple delivers it only through this parameter.

Evidence timeline and material changes

  1. Published upstream

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 31, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source description

Acceptance of Extraneous Untrusted Data With Trusted Data vulnerability in the Sign in with Apple strategy in pow-auth Assent allows an unauthenticated remote attacker to impersonate another user via the user parameter of the authorization callback. Apple posts the user's name to the callback endpoint in a user form parameter that the browser submits and the client controls. Assent.Strategy.Apple.callback/2 in lib/assent/strategies/apple.ex decodes that parameter, and fetch_user/2 merges it over the claims of the verified ID token, so the unverified map wins. An attacker who completes a Sign in with Apple login with their own Apple ID and edits the user parameter can replace sub, email, and any other claim. Applications that look up, link, or authorize accounts by the returned subject or email then act on the attacker's values. This issue affects assent: from 0.1.25 before 0.3.2.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • ActivityPub Undo handler can unfollow or remove reposts on behalf of other accountsAlso CWE-290

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-290, CWE-349
Source
CVE List V5
Source checked
Oct 31, 2026
References
5 linked sources
Open source record