How severe is CVE-2026-3963?

CVE-2026-3963 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-3963 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3963?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3963 have an EU (EUVD) identifier?

Yes. CVE-2026-3963 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11485.

When was CVE-2026-3963 published?

CVE-2026-3963 was published on 2026-03-11 and last updated on 2026-06-17.

CVE-2026-3963

CVE-2026-3963 is a low-severity vulnerability with a CVSS 3.x base score of 3.7. 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-320.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
CVSS v2: 2.6
CVSS v4: 2.9
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11485
Weakness: CWE-320
Published: 2026-03-11
Last modified: 2026-06-17

Description

A security flaw has been discovered in perfree go-fastdfs-web up to 1.3.7. This affects the function rememberMeManager of the file src/main/java/com/perfree/config/ShiroConfig.java of the component Apache Shiro RememberMe. Performing a manipulation results in use of hard-coded cryptographic key . The attack can be initiated remotely. The complexity of an attack is rather high. The exploitability is reported as difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2026-3963?: A security flaw has been discovered in perfree go-fastdfs-web up to 1.3.7. This affects the function rememberMeManager of the file src/main/java/com/perfree/config/ShiroConfig.java of the component Apache Shiro RememberMe. Performing a manipulation results in use of hard-coded cryptographic key . The attack can be initiated remotely. The complexity of an attack is rather high. The exploitability is reported as difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2026-3963?: CVE-2026-3963 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-3963 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-3963?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3963 have an EU (EUVD) identifier?: Yes. CVE-2026-3963 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11485.
When was CVE-2026-3963 published?: CVE-2026-3963 was published on 2026-03-11 and last updated on 2026-06-17.

References

Other CWE-320 vulnerabilities

CVE-2016-10467 — Critical (CVSS 9.8): In Android before 2018-04-05 or earlier security patch level on Qualcomm Snapdragon Automobile and Snapdragon Mobile SD…
CVE-2016-10421 — Critical (CVSS 9.8): In Android before 2018-04-05 or earlier security patch level on Qualcomm Snapdragon Mobile and Snapdragon Wear MDM9206,…
CVE-2018-0124 — Critical (CVSS 9.8): A vulnerability in Cisco Unified Communications Domain Manager could allow an unauthenticated, remote attacker to…
CVE-2015-0936 — Critical (CVSS 9.8): Ceragon FibeAir IP-10 have a default SSH public key in the authorized_keys file for the mateidu user, which allows…
CVE-2015-4166 — Critical (CVSS 9.8): Cloudera Key Trustee Server before 5.4.3 does not store keys synchronously, which might allow attackers to have…
CVE-2024-36391 — Critical (CVSS 9.1): MileSight DeviceHub - CWE-320: Key Management Errors may allow Authentication Bypass and Man-In-The-Middle Traffic

Browse all CWE-320 vulnerabilities →