8.1

CVE-2026-41076: RT: LDAP authentication bypass via empty password

Deferred
AliasesUBUNTU-CVE-2026-41076DEBIAN-CVE-2026-41076
Published 22-05-2026Last modified 28-05-2026

Vulnerability summary

CVE-2026-41076 is a high (CVSS 8.1) Improper Authentication vulnerability in bestpractical rt. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.8% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.66%
0%100%
Low · +0.27 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
USN-8506-1

Timeline

  1. 22-05-2026
    PublishedVulnerability first disclosed.
  2. 28-05-2026
    Last modifiedVulnerability information updated.

Description

RT is an open source, enterprise-grade issue and ticket tracking system. Versions 5.0.9 and prior in addition to 6.0.0 through 6.0.2 contain an authentication bypass vulnerability in RT installations that use LDAP/AD for user authentication. Under certain LDAP server configurations, an attacker may be able to authenticate as any LDAP-backed RT user without supplying valid credentials. This issue has been fixed in versions 5.0.10 and 6.0.3. If developers are unable to upgrade immediately, they can temporarily work around this issue by reviewing their LDAP server's authentication policy to ensure it rejects unauthenticated bind attempts. Upgrading RT remains the recommended fix.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

Increase +0.27 pp

From 0.39% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • request-tracker4< 4.4.6+dfsg-1.1+deb12u4
  • request-tracker5< 5.0.3+dfsg-3~deb12u6 | < 5.0.7+dfsg-4+deb13u3 | < 5.0.10+dfsg-1
Ubuntu2 products
  • request-tracker4All versions (No fix recorded)
  • request-tracker5< 5.0.1+dfsg-1ubuntu1+esm2 | < 5.0.5+dfsg-2ubuntu0.1~esm2 | All versions (No fix recorded) | < 5.0.7+dfsg-6ubuntu0.1~esm1
Bestpractical1 product
  • rt< 5.0.10 | ≥ 6.0.0, < 6.0.3

3 vendors · 5 products

References

7 links