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CVE-2026-55735

Improper Verification of Cryptographic Signature in ueberauth guardian allows an unauthenticated attacker to revoke a victim's session with a forged token. Guardian.revoke/3 in lib/guardian.ex decodes the supplied token with peek/1, which performs no signature verification (it only base64-decodes the JWT header and payload). The resulting unverified claims are forwarded directly to the configured token module's revoke callback and the implementation's on_revoke callback, a state-mutating sink.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:260fb937ac234db24e6d71f129cb7217122239787532bbe538ad7529c56997e1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Guardian'"],"packageName":"ueberauth/guardian","packageURL":"pkg:github/ueberauth/guardian","product":"guardian","programFiles":["lib/guardian.ex"],"programRoutines":[{"name":"'Elixir.Guardian':revoke/3"}],"repo":"https://github.com/ueberauth/guardian","vendor":"ueberauth","versions":[{"lessThan":"2bd7a8c29770d423d855c0a4965caa6c3e486901","status":"affected","version":"d65227145f72b290106c06cecbe42728fbf05fe2","versionType":"git"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/affected/1

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Guardian'"],"packageName":"guardian","packageURL":"pkg:hex/guardian","product":"guardian","programFiles":["lib/guardian.ex"],"programRoutines":[{"name":"'Elixir.Guardian':revoke/3"}],"repo":"https://github.com/ueberauth/guardian","vendor":"ueberauth","versions":[{"lessThan":"2.4.1","status":"affected","version":"1.0.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Guardian'"],"packageName":"ueberauth/guardian","packageURL":"pkg:github/ueberauth/guardian","product":"guardian","programFiles":["lib/guardian.ex"],"programRoutines":[{"name":"'Elixir.Guardian':revoke/3"}],"repo":"https://github.com/ueberauth/guardian","vendor":"ueberauth","versions":[{"lessThan":"2bd7a8c29770d423d855c0a4965caa6c3e486901","status":"affected","version":"d65227145f72b290106c06cecbe42728fbf05fe2","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/affected/1
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ueberauth:guardian:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.Guardian'"],"packageName":"guardian","packageURL":"pkg:hex/guardian","product":"guardian","programFiles":["lib/guardian.ex"],"programRoutines":[{"name":"'Elixir.Guardian':revoke/3"}],"repo":"https://github.com/ueberauth/guardian","vendor":"ueberauth","versions":[{"lessThan":"2.4.1","status":"affected","version":"1.0.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.2,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-347","description":"CWE-347 Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-55735.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/ueberauth/guardian/commit/2bd7a8c29770d423d855c0a4965caa6c3e486901"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/references/3
{"tags":["exploit"],"url":"https://github.com/ueberauth/guardian/security/advisories/GHSA-7975-hp3r-5qhv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/adp/0/references/0
{"tags":["vendor-advisory","related"],"url":"https://github.com/ueberauth/guardian/security/advisories/GHSA-7975-hp3r-5qhv"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-55735"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c8d8aa0700420979450e7f7b4be39583f2a7ef277b15ae278a7dd56c1f2f54f5 · sha256:a9c1def5968972d4… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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