7.5

CVE-2026-34087: mediawiki

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-34087DEBIAN-CVE-2026-34087
Published 11-05-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-34087 is a high (CVSS 7.5) vulnerability in mediawiki. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.37%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
USN-8315-1

Timeline

  1. 11-05-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation OATHAuth. This issue affects OATHAuth: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

+0.10 pp

From 0.27% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • mediawiki< 1:1.39.17-1+deb12u2 | < 1:1.43.8+dfsg-1~deb13u1 | < 1:1.43.8+dfsg-1
Mediawiki1 product
  • mediawiki< 1.43.7 | ≥ 1.44.0, < 1.44.4 | ≥ 1.45.0, < 1.45.2
Ubuntu1 product
  • mediawiki< 1:1.35.6-1ubuntu0.1~esm1 | < 1:1.39.7-1ubuntu0.1~esm1 | All versions (No fix recorded) | < 1:1.43.8+dfsg-2
Wikimedia foundation1 product

4 vendors · 4 products

References

7 links