CVE-2026-34151

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 56% 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 week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.2Exploit: None knownExposed: 0

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

XWiki Platform is a generic wiki platform. Prior to 17.10.5 and 18.2.0, the /skin/ action in com.xpn.xwiki.web.SkinAction can resolve double-encoded parent-directory segments outside the intended skin or web-application resource prefix when Jetty 12 or later decodes the request path. The affected lookup is replaced with Environment.getResourceAsStream(String, String), which constrains a resource to its expected prefix. An unauthenticated remote attacker can use the vulnerable behavior to read arbitrary resources permitted to the Jetty process, including WEB-INF/xwiki.cfg and, depending on deployment depth and operating-system permissions, host files. Tomcat and Jetty versions before 12 do not appear affected. This issue is fixed in versions 17.10.5 and 18.2.0.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: Track

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
Severity82% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

July 7, 2026

Last Modified

September 14, 2026

Advisory Details (8)

Auto-updated Sep 14, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
generic

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https://jira.xwiki.org/browse/XWIKI-24075
generic

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https://jira.xwiki.org/browse/XCOMMONS-3594
github_release Patch Available

18.2.0

Patch available: xwiki/xwiki-platform xwiki-platform-18.2.0

https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-18.2.0
github_release Patch Available

17.10.5

Patch available: xwiki/xwiki-platform xwiki-platform-17.10.5

https://github.com/xwiki/xwiki-platform/releases/tag/xwiki-platform-17.10.5
github_commit Patch Available

commit f7b33704083d (xwiki/xwiki-platform)

Patch available: xwiki/xwiki-platform xwiki-platform-18.3.0-rc-1 (contains commit f7b33704083d)

https://github.com/xwiki/xwiki-platform/commit/f7b33704083d3b4e45d1b9fc1e2cc33c66855f85
github_commit Patch Available

commit 79eba8655f3a (xwiki/xwiki-platform)

Patch available: xwiki/xwiki-platform xwiki-platform-17.10.5 (contains commit 79eba8655f3a)

https://github.com/xwiki/xwiki-platform/commit/79eba8655f3a96021a8e7ad07956e48d20a82383
github_pr Patch Available

XCOMMONS-3594: Make a lot easier to protect against resource path traversal

Patch available: xwiki/xwiki-commons xwiki-commons-18.3.0-rc-1 (PR #1675 merged 2026-03-25)

https://github.com/xwiki/xwiki-commons/pull/1675
github Patch Available

Resource path traversal via /skin/ action endpoint in Jetty 12+ · Advisory · xwiki/xwiki-platform · GitHub

https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qj4x-9g63-25g6

Vendor Advisories for CVE-2026-34151(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.xwiki.platform:xwiki-platform-oldcore—18.2.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 11× 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.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 05:50 UTCEG score recompute
  4. 2026-09-17 19:30 UTCEPSS rescore
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-14 19:23 UTCEG score recompute
  8. 2026-09-14 19:05 UTCEG score recompute
  9. 2026-09-14 18:38 UTCEG score recompute
  10. 2026-09-14 17:21 UTCEG score recompute▲ 8.20
  11. 2026-09-14 17:21 UTCMITRE cvelistV5CVSS v3 → 8.2 · CVSS v4 → 8.2
  12. 2026-08-01 08:06 UTCEG score recompute
  13. 2026-07-26 12:41 UTCEG score recompute
  14. 2026-07-23 03:09 UTCEG score recompute
  15. 2026-07-07 13:38 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-34151?
CVE-2026-34151 is a high vulnerability published on July 7, 2026. XWiki Platform is a generic wiki platform. Prior to 17.10.5 and 18.2.0, the /skin/ action in com.xpn.xwiki.web.SkinAction can resolve double-encoded parent-directory segments outside the intended skin or web-application resource prefix when Jetty 12 or later decodes the request path. The affected…
When was CVE-2026-34151 disclosed?
CVE-2026-34151 was first published in the National Vulnerability Database on July 7, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34151 actively exploited?
CVE-2026-34151 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.6% of all scored CVEs.
What is the CVSS score of CVE-2026-34151?
CVE-2026-34151 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-34151?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34151, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-34151

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