CVE-2021-21494

MEDIUMNVD 4.84.8—

4.8

MK-AUTH through 19.01 K4.9 allows XSS via the admin/logs_ajax.php tipo parameter. An attacker can leverage this to read the centralmka2 (session token) cookie, which is not set to HTTPOnly.

CVSS v3: 4.8
EG Score: 4.8(medium)
EPSS: 40.6%
KEV: Not listed

Published

January 4, 2021

Last Modified

November 21, 2024

References (4)

cve@mitrehttp://mk-auth.com.br/
cve@mitrehttps://gist.github.com/alacerda/380b8923e36a29a02ba1457c1eb3ec2f
af854a3a-2127-422b-91ae-364da2661108http://mk-auth.com.br/
af854a3a-2127-422b-91ae-364da2661108https://gist.github.com/alacerda/380b8923e36a29a02ba1457c1eb3ec2f

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 22:40 UTCEG score recompute
2026-05-26 22:40 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 20:42 UTCOSV refresh
2026-05-24 16:49 UTCepss_batch

Frequently asked(5)

What is CVE-2021-21494?

CVE-2021-21494 is a medium vulnerability published on January 4, 2021. MK-AUTH through 19.01 K4.9 allows XSS via the admin/logs_ajax.php tipo parameter. An attacker can leverage this to read the centralmka2 (session token) cookie, which is not set to HTTPOnly.

When was CVE-2021-21494 disclosed?

CVE-2021-21494 was first published in the National Vulnerability Database on January 4, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-21494 actively exploited?

CVE-2021-21494 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-21494?

CVE-2021-21494 has a CVSS v3 base score of 4.8 (NVD).

How do I remediate CVE-2021-21494?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21494, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-21494

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Is Your Infrastructure Affected by CVE-2021-21494?

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Frequently asked(5)

What is CVE-2021-21494?

When was CVE-2021-21494 disclosed?

Is CVE-2021-21494 actively exploited?

What is the CVSS score of CVE-2021-21494?

CVE-2021-21494 has a CVSS v3 base score of 4.8 (NVD).

How do I remediate CVE-2021-21494?

CVE-2021-21494

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-21494?

CVE-2021-21494

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-21494?

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References (4)

Frequently asked(5)

Published

Last Modified

References (4)

Frequently asked(5)

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