7.1

CVE-2026-49284: simplesamlphp

CVSS: 7.1v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-49284DEBIAN-CVE-2026-49284
Published 17-07-2026Last modified 20-07-2026
Open JSON

Vulnerability summary

CVE-2026-49284 is a high (CVSS 7.1) vulnerability in simplesamlphp. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.1% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 17-07-2026
    PublishedVulnerability first disclosed.
  2. 20-07-2026
    Last modifiedVulnerability information updated.

Description

SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

0.00 pp

From 0.22% on 22-09-2026

22-09-202622-10-2026
EPSS score
0.22%

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
  • simplesamlphpAll versions (No fix recorded) | < 2.4.8-1
Simplesamlphp1 product
  • simplesamlphp≥ 2.5.0-rc1, < 2.5.2 | < 2.4.7 | ≥ 2.5.0, < 2.5.2
Ubuntu1 product
  • simplesamlphpAll versions (No fix recorded)

3 vendors · 3 products

References

6 links