CVE-2026-29000

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 5.9%, top 8% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
72(Attend)
EG Risk 72/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
92.4%
KEV
Not listed

Published

March 4, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated May 22, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

pac4j-jwt JwtAuthenticator Authentication Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass
generic

Security advisory for pac4j-jwt (JwtAuthenticator) | pac4j

https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html
generic🟡 PoC Available

CVE-2026-29000: Critical Auth Bypass in pac4j-jwt: Full PoC Using Only a Public Key

https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.pac4j:pac4j-jwt1.8.0 ... 4.5.8 (68 versions)4.5.9—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 15× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:08 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
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  10. 2026-07-19 14:31 UTCEPSS rescore
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  15. 2026-07-17 16:29 UTCOSV refresh
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  1. 2026-07-08 15:15 UTCEPSS rescore
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  24. 2026-06-21 14:56 UTCEPSS rescore
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  28. 2026-06-18 17:52 UTCEPSS rescore
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  43. 2026-06-07 15:25 UTCEPSS rescore
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  46. 2026-06-06 13:47 UTCEPSS rescore
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  50. 2026-06-05 06:10 UTCEPSS rescore
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  52. 2026-06-04 13:12 UTCEPSS rescore
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  62. 2026-05-29 13:44 UTCEPSS rescore
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  64. 2026-05-28 13:44 UTCEPSS rescore
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  72. 2026-05-26 07:18 UTCEPSS rescore
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  75. 2026-05-24 16:59 UTCEPSS rescore

Publicly available exploits

(3 references)

Working exploit code is in the public domain (3 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCtc4dy/CVE-2026-29000-PoC-Exploit
    First seen May 12, 2026

    CVE-2026-29000 – pac4j-jwt Authentication Bypass (🔥 CVSS 10.0). One-click admin forge via public key JWE wrapping. Leaks configs, users, secrets. Keep-alive, proxy, custom JWKS.⚙️ Educational PoC Exploit tool.

    Open source ↗
  • GitHub PoCstrikoder/CVE-2026-29000-pac4j-jwt
    First seen May 3, 2026

    CVE-2026-29000 PoC: pac4j-jwt PlainJWT-in-JWE authentication bypass.

    Open source ↗
  • GitHub PoCSTK-Security/CVE-2026-29000-pac4j-jwt
    First seen May 3, 2026

    CVE-2026-29000 PoC: pac4j-jwt PlainJWT-in-JWE authentication bypass.

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-29000?
CVE-2026-29000 is a critical vulnerability published on March 4, 2026. pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with…
When was CVE-2026-29000 disclosed?
CVE-2026-29000 was first published in the National Vulnerability Database on March 4, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-29000 actively exploited?
CVE-2026-29000 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-29000?
CVE-2026-29000 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-29000?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-29000, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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