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Fencer Vulns
high 7.7

CVE-2023-28853 json

Mastodon's blind LDAP injection in login allows the attacker to leak arbitrary attributes from LDAP database

published 2023-04-04 3 y ago modified 2026-09-10 59 d ago also BIT-mastodon-2023-28853 , EUVD-2023-32477 , GHSA-38g9-pfm9-gfqv

cvss
7.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Mastodon is a free, open-source social network server based on ActivityPub Mastodon allows configuration of LDAP for authentication. Starting in version 2.5.0 and prior to versions 3.5.8, 4.0.4, and 4.1.2, the LDAP query made during login is insecure and the attacker can perform LDAP injection attack to leak arbitrary attributes from LDAP database. This issue is fixed in versions 3.5.8, 4.0.4, and 4.1.2.

Patch / fix

  • bitnami mastodon 3.5.8, 4.0.4, 4.1.2
  • joinmastodon mastodon 3.5.8, 4.0.4, 4.1.2

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/mastodon/mastodon/security/advisories/GHSA-38g9-pfm9-gfqv referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
bitnami mastodon
>=2.5.0, <3.5.8
>=4.0.0, <4.0.4
>=4.1.0, <4.1.2
3.5.8
4.0.4
4.1.2

Affected products

  • mastodon mastodon

Classification

Weakness
  • CWE-90 Improper Neutralization of Special Elements used in an LDAP Query
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.