CVE-2021-27335

9.8 criticalEPSS 3.0%

Critical (9.8) in kollectapp kollect. EPSS 3.0% chance of exploitation in the next 30 days.

KollectApps before 4.8.16c is affected by insecure Java deserialization, leading to Remote Code Execution via a ysoserial.payloads.CommonsCollections parameter.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 3.0% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
CWE: CWE-502
Published: 2021-02-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

kollectapp:kollect

References

https://hacked0x90.net/index.php/2021/02/15/kollectapp-insecure-java-deserialization/
https://hacked0x90.net/index.php/2021/02/15/kollectapp-insecure-java-deserialization/

Check your stack JSON