CVE-2022-23540

highpriority · track · 30OT risk · elevatedEPSS 0.006 · 47 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.57% (47th) EPSS
CVSS 7.6 · high
Is it mine?
33 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · cert_bund · osv

EPSS · scored 2026-10-27

In versions `<=8.5.1` of `jsonwebtoken` library, lack of algorithm definition in the `jwt.verify()` function can lead to signature validation bypass due to defaulting to the `none` algorithm for signature verification. Users are affected if you do not specify algorithms in the `jwt.verify()` function. This issue has been fixed, please update to version 9.0.0 which removes the default support for the none algorithm in the `jwt.verify()` method. There will be no impact, if you update to version 9.0.0 and you don’t need to allow for the `none` algorithm. If you need 'none' algorithm, you have to explicitly specify that in `jwt.verify()` options.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.6
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–7.6

v3.17.6highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:Lprimary · NVD / NIST USexploitability 2.8 · impact 4.7
v3.16.4mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:Lsecondary · ENISA EU
v3.16.4mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:Lsecondary · security-advisories@github.comexploitability 1.6 · impact 4.7
v3.16.4mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:Lsecondary · OSV
v3.17highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

04

affected products (33)

Products and version ranges known to be affected.

05

advisories (4)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2023-0218IBM Integration Bus: Mehrere SchwachstellenDeutsch2023-01-29csaf · cert_bundDE

    Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in IBM Integration Bus ausnutzen, um beliebigen Programmcode auszuführen oder Sicherheitsvorkehrungen zu umgehen.

  • WID-SEC-W-2023-1208HCL BigFix: Mehrere SchwachstellenDeutsch2023-05-14csaf · cert_bundDE

    Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in HCL BigFix ausnutzen, um einen Denial of Service Zustand herbeizuführen oder Sicherheitsvorkehrungen zu umgehen.

  • WID-SEC-W-2023-1542Red Hat OpenShift: Mehrere SchwachstellenDeutsch2023-06-22csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat OpenShift ausnutzen, um einen Denial of Service Zustand herbeizuführen, Informationen offenzulegen, Dateien zu manipulieren oder Sicherheitsvorkehrungen zu umgehen.

  • GHSA-qwph-4952-7xr6jsonwebtoken vulnerable to signature validation bypass due to insecure default algorithm in jwt.verify()2022-12-22ghsa · osvUS

    # Overview In versions <=8.5.1 of jsonwebtoken library, lack of algorithm definition and a falsy secret or key in the `jwt.verify()` function can lead to signature validation bypass due to defaulting to the `none` algorithm for signature verification. # Am I affected? You will be affected if all the following are true in the `jwt.verify()` function: - a token with no signature is received - no algorithms are specified - a falsy (e.g. null, false, undefined) secret or key is passed # How do I fix it? Update to version 9.0.0 which removes the default support for the none algorithm in the `jwt.verify()` method. # Will the fix impact my users? There will be no impact, if you update to version 9.0.0 and you don’t need to allow for the `none` algorithm. If you need 'none' algorithm, you have to explicitly specify that in `jwt.verify()` options.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

published 2022-12-22modified 2026-06-17
09

references (10)

External citations — patches, advisories, analysis.

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