CVE-2022-25898Public exploitNetwork attack vector

Signature validation bypass via malformed Base64URL input

Published Jul 1, 2022 · Updated Sep 16, 2024

Improper signature verification in jsrsasign before 10.5.25 allows remote attackers to pass altered JWS or JWT signatures as valid. JWS.verify() and JWS.verifyJWT() fail to reject non-Base64URL special or numeric escape characters before decoding and verifying signature segments. The flaw affects authentication or authorization when an application relies on these methods to validate attacker-supplied tokens.

CVSS severity8.6
High
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in jsrsasign before 10.5.25 allows remote attackers to pass altered JWS or JWT signatures as valid. JWS.verify() and JWS.verifyJWT() fail to reject non-Base64URL special or numeric escape characters before decoding and verifying signature segments. The flaw affects authentication or authorization when an application relies on these methods to validate attacker-supplied tokens.

The record

CVE
CVE-2022-25898
Published
Jul 1, 2022
Updated
Sep 16, 2024
Vendor
jsrsasign project
Product
jsrsasign
Classifications
CWE-347, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <10.5.25

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

jsrsasign project · jsrsasignversion=unspecified <10.5.25

Published CVSS scores

8.6jsrsasign projectCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
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

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Your stack

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