How severe is CVE-2015-9235?

CVE-2015-9235 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2015-9235 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-9235?

CVE-2015-9235 affects Auth0 Jsonwebtoken. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-9235?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2015-9235 published?

CVE-2015-9235 was published on 2018-05-29 and last updated on 2026-06-17.

CVE-2015-9235

CVE-2015-9235 is a critical-severity vulnerability in Auth0 Jsonwebtoken with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 9% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Auth0 Jsonwebtoken
Published: 2018-05-29
Last modified: 2026-06-17

Description

In jsonwebtoken node module before 4.2.2 it is possible for an attacker to bypass verification when a token digitally signed with an asymmetric key (RS/ES family) of algorithms but instead the attacker send a token digitally signed with a symmetric algorithm (HS* family).

Frequently asked questions

What is CVE-2015-9235?: In jsonwebtoken node module before 4.2.2 it is possible for an attacker to bypass verification when a token digitally signed with an asymmetric key (RS/ES family) of algorithms but instead the attacker send a token digitally signed with a symmetric algorithm (HS* family).
How severe is CVE-2015-9235?: CVE-2015-9235 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2015-9235 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-9235?: CVE-2015-9235 affects Auth0 Jsonwebtoken. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-9235?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2015-9235 published?: CVE-2015-9235 was published on 2018-05-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:auth0:jsonwebtoken:*:*:*:*:*:node.js:*:*

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