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VulnerabilityPublished Updated

CVE-2026-40995: Spring Web Services · Improper Authentication

Affects Spring Web ServicesSource CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium · fixed in 5.0.1.1 : update Spring Web Services when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.0.1.1, 4.1.3.1, 4.0.19 +1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade Spring Web Services to 5.0.1.1, 4.1.3.1, 4.0.19 or 3.1.9.

Affected software

ProductAffectedFixed in
SpringSpring Web ServicesAffected
  • >=5.0.0 <5.0.1.1
Fixed in
  • 5.0.1.1
SpringSpring Web ServicesAffected
  • >=4.1.0 <4.1.3.1
Fixed in
  • 4.1.3.1
SpringSpring Web ServicesAffected
  • >=4.0.0 <4.0.19
Fixed in
  • 4.0.19
SpringSpring Web ServicesAffected
  • >=3.1.0 <3.1.9
Fixed in
  • 3.1.9

AI-suggested

If you cannot patch yet, users should review their use of X509AuthenticationProvider and consider additional custom checks to enforce account lifecycle status. Monitoring for unusual authentication activity related to certificate-based logins may help detect exploitation attempts.

Description

X509AuthenticationProvider could issue a fully authenticated X509AuthenticationToken when a presented certificate mapped to UserDetails, without applying Spring Security's standard account lifecycle checks (disabled, locked, expired, or credentials-expired accounts). Affected versions: Spring Web Services 5.0.0 through 5.0.1; 4.1.0 through 4.1.3; 4.0.0 through 4.0.18; 3.1.0 through 3.1.8.

References

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