CVE-2026-32600Public exploitNetwork attack vector

XML decryption and forgery via truncated GCM tags

Published Mar 13, 2026 · Updated Mar 13, 2026

Improper tag validation in SimpleSAMLphp xml-security before 1.13.9 and 2.0.0 through 2.3.0 allows remote attackers to decrypt XML nodes. In OpenSSL.php decrypt(), substr() accepts ciphertext too short to contain a 16-byte tag, and the result reaches OpenSSL without a length check. Exploitation requires an application to process attacker-controlled AES-GCM-encrypted XML and expose distinguishable parsing errors; the oracle reveals plaintext and supports ciphertext forgery.

CVSS severity8.2
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper tag validation in SimpleSAMLphp xml-security before 1.13.9 and 2.0.0 through 2.3.0 allows remote attackers to decrypt XML nodes. In OpenSSL.php decrypt(), substr() accepts ciphertext too short to contain a 16-byte tag, and the result reaches OpenSSL without a length check. Exploitation requires an application to process attacker-controlled AES-GCM-encrypted XML and expose distinguishable parsing errors; the oracle reveals plaintext and supports ciphertext forgery.

The record

CVE
CVE-2026-32600
Published
Mar 13, 2026
Updated
Mar 13, 2026
Vendor
SimpleSAMLphp
Product
xml-security
Classifications
CWE-354, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SimpleSAMLphp · xml-securityversion=< 2.3.1

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo