CVE-2021-45915

CRITICALNVD 9.89.8—

9.8

In LuxSoft LuxCal Web Calendar before 5.2.0, an unauthenticated attacker can manipulate a cookie value. This allows the attacker's session to be authenticated as any registered LuxCal user, including the site administrator.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 79.3%
KEV: Not listed

Published

May 24, 2022

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated May 25, 2026

No patch confirmed yet.

generic

LuxSoft Download

https://www.luxsoft.eu/index.php?pge=dload

generic

https://twitter.com/h1pmnh

generic

LuxCal 5.1.x and below Authentication Bypass: CVE-2021-45914, CVE-2021-45915 | A developer's notes in the world of security research and bug bounty, by pmnh

https://h1pmnh.github.io/post/cve-luxcal-2021/

generic

h1pmnh (@pmnh) · GitHub

https://github.com/h1pmnh

Weakness Classification(1)

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

CWE-287Improper Authentication

Data Freshness Timeline

(refreshed 15× 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.

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Frequently asked(5)

What is CVE-2021-45915?

CVE-2021-45915 is a critical vulnerability published on May 24, 2022. In LuxSoft LuxCal Web Calendar before 5.2.0, an unauthenticated attacker can manipulate a cookie value. This allows the attacker's session to be authenticated as any registered LuxCal user, including the site administrator.

When was CVE-2021-45915 disclosed?

CVE-2021-45915 was first published in the National Vulnerability Database on May 24, 2022, 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-2021-45915 actively exploited?

CVE-2021-45915 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-45915?

CVE-2021-45915 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-45915?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-45915, 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

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CVE-2021-45915

📅 Published

🔄 Last Modified

📋 Advisory Details (4)

LuxSoft Download

LuxCal 5.1.x and below Authentication Bypass: CVE-2021-45914, CVE-2021-45915 | A developer's notes in the world of security research and bug bounty, by pmnh

h1pmnh (@pmnh) · GitHub

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-45915?

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Advisory Details (4)

Frequently asked(5)

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