HOMEVULNERABILITIESCVE-2026-25138
MEDIUM

CVE-2026-25138

CWE-204Published: February 25, 2026· Updated: Feb 27, 2026

5.3
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:10.7th

Official Description

Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Prior to versions 35.8.3, 38.5.4, and 39.3.1, the WebUI login endpoint returns distinct error messages depending on whether a supplied username exists, allowing unauthenticated attackers to enumerate valid usernames. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.

NVD Source

Technical Analysis

CVE-2026-25138 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected Vendors & Products

cern1 product
rucio
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9
ADVISORYhttps://github.com/rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9

All References (6)

→
https://cheatsheetseries.owasp.org/cheatsheets/Authentication_Cheat_Sheet.html#authentication-and-error-messagesNot Applicable
→
https://github.com/rucio/rucio/releases/tag/35.8.3Product · Release Notes
→
https://github.com/rucio/rucio/releases/tag/38.5.4Product · Release Notes
→
https://github.com/rucio/rucio/releases/tag/39.3.1Product · Release Notes
→
https://github.com/rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9Exploit · Vendor Advisory
→
https://github.com/rucio/rucio/security/advisories/GHSA-38wq-6q2w-hcf9Exploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-25138
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-204
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedFeb 25, 2026

Related CVEs (CWE-204)

CVE-2018-25350
9.8
CVE-2026-33419
9.1
CVE-2019-25338
7.5
CVE-2026-4113
7.2
CVE-2026-53908
6.9
CVE-2026-54445
6.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-25138 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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