CVE-2021-27522

Name: CVE-2021-27522
Creator: NVD / NIST
Published: 2021-04-08T16:15:13.473+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.11%

Last modified Jun 17, 2026

CVE-2021-27522 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Learnsite 1.2.5.0 contains a remote privilege escalation vulnerability in /Manager/index.aspx through the JudgIsAdmin() function. By modifying the initial letter of the key of a user cookie, the key of the administrator cookie can be obtained.. EPSS estimates a 1.11% chance of exploitation in the next 30 days.

Description

Learnsite 1.2.5.0 contains a remote privilege escalation vulnerability in /Manager/index.aspx through the JudgIsAdmin() function. By modifying the initial letter of the key of a user cookie, the key of the administrator cookie can be obtained.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.11%

61.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Learnsite Project	Learnsite	1.2.5.0

References

https://github.com/WaterCountry/Learnsite/issues/1Exploit, Issue Tracking, Third Party Advisory
https://github.com/WaterCountry/Learnsite/issues/1Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Apr 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27522?

How severe is CVE-2021-27522?

CVE-2021-27522 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.11% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27522?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27522?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST