Internet2 Grouper before 5.6 allows authentication bypass when LDAP authentication is used in certain ways.

published 2024-06-29 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-38267

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits: 0; none known

Internet2 Grouper before 5.6 allows authentication bypass when LDAP authentication is used in certain ways. This is related to internet2.middleware.grouper.ws.security.WsGrouperLdapAuthentication and the use of the UyY29r password for the M3vwHr account. This also affects "Grouper for Web Services" before 4.13.1.

Patch / fix

fixed in 1

internet2 grouper 5.6

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 19 mo ago (2025-03-25)

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

internet2 grouper

Classification

Weakness

CWE-1390 Weak Authentication

References

spaces.at.internet2.edu /display/Grouper/Grouper+bug+-+GRP-5515+-+web+services+LDAP+authentication+security+vulnerability

Sources

CVE List CVE-2024-39848
NVD CVE-2024-39848

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.

Summary