CVE-2026-34151

HIGHPre-NVD 8.28.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 2.5% (84th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-77676 (ENISA EUVD) · GHSA-qj4x-9g63-25g6 (GitHub Security Advisories)Source: ENISA EUVD

8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.5%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.2HIGHmedium confidence
EG Risk
52
EG Risk 52/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.5%
EPSS %ILE
84th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
2.5% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 7, 2026

Last Modified

September 30, 2026

Advisory Details (8)

Auto-updated Sep 14, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
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 pull request 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 advisoryMentions a patch (unverified)

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 rangeFix by version rangeDependents
org.xwiki.platform:xwiki-platform-oldcore—
  • every version up to 17.10.5: fixed in 17.10.5
  • 18.0.0-rc-1 up to 18.2.0: fixed in 18.2.0
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 37× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 60 is merged into the row it repeats.

  1. 2026-10-30 16:34 UTCEPSS rescoreEPSS 2.5% · 84th percentile
  2. 2026-10-29 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  3. 2026-10-28 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  4. 2026-10-27 16:31 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  5. 2026-10-26 16:31 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  6. 2026-10-25 14:34 UTCEG score recompute
  7. 2026-10-24 17:36 UTCEG score recompute
  8. 2026-10-24 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  9. 2026-10-23 16:31 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  11. 2026-10-21 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  14. 2026-10-18 16:31 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  15. 2026-10-18 03:46 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  17. 2026-10-17 15:39 UTCEG score recompute
  18. 2026-10-16 16:41 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  19. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  20. 2026-10-14 16:32 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  21. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  22. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  23. 2026-10-12 16:12 UTCEG score recompute
  24. 2026-10-11 19:55 UTCEG score recompute
  25. 2026-10-11 17:08 UTCEG score recompute
Show 34 more
  1. 2026-10-11 14:35 UTCEG score recompute
  2. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  4. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  6. 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  7. 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  8. 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  11. 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  12. 2026-09-30 20:04 UTCEG score recompute
  13. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  14. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  15. 2026-09-28 13:37 UTCEG score recompute
  16. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  17. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  18. 2026-09-26 00:26 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  19. 2026-09-23 06:19 UTCEG score recompute
  20. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  21. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  22. 2026-09-18 05:50 UTCEG score recompute
  23. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  26. 2026-09-14 19:23 UTCEG score recompute
  27. 2026-09-14 19:05 UTCEG score recompute
  28. 2026-09-14 18:38 UTCEG score recompute
  29. 2026-09-14 17:21 UTCEG score recomputeFirst assessed: 8.2 HIGH
  30. 2026-09-14 17:21 UTCMITRE cvelistV5CVSS v3 → 8.2 · CVSS v4 → 8.2
  31. 2026-08-01 08:06 UTCEG score recompute
  32. 2026-07-26 12:41 UTCEG score recompute
  33. 2026-07-23 03:09 UTCEG score recompute
  34. 2026-07-07 13:38 UTCEG score recompute

Public detection templates

(1 reference)

A public Nuclei detection template is referenced for this CVE. A detection template checks whether a system is affected; it is not necessarily exploit code.

  • Nucleihttp/cves/2026/CVE-2026-34151.yaml
    Recorded Oct 29, 2026

    XWiki Platform - Path Traversal

    Open source ↗

Frequently asked(5)

What is CVE-2026-34151?
CVE-2026-34151 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-34151 published?
The CVE record for CVE-2026-34151 was published on July 7, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 30, 2026; the record at its source may have been updated since.
Is CVE-2026-34151 actively exploited?
CVE-2026-34151 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.5% probability of exploitation in the next 30 days (84th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-34151?
CVE-2026-34151 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-34151?
A fix for CVE-2026-34151 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-34151 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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