PatchTheCVECVE-2020-5290: In RedpwnCTF before version 2.3, there is a session fixation vulnerability in exploitable through the `#token=
CVE-2020-5290 is a medium-severity flaw (CVSS 6.5) affecting rctf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
In RedpwnCTF before version 2.3, there is a session fixation vulnerability in exploitable through the `#token=$ssid` hash when making a request to the `/verify` endpoint. An attacker team could potentially steal flags by, for example, exploiting a stored XSS payload in a CTF challenge so that victim teams who solve the challenge are unknowingly (and against their will) signed into the attacker team's account. Then, the attacker can gain point
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.8% (top 43%) |
| CISA exploited list | No |
| Weakness | CWE-384 |
| Published | 2020-04-01 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-5290?
rctf: upgrade to 2.3. Exact commands for each OS are on this page.
Is CVE-2020-5290 being exploited?
CVE-2020-5290 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-5290 affect?
CVE-2020-5290 affects rctf. Severity is medium (CVSS 6.5). In RedpwnCTF before version 2.3, there is a session fixation vulnerability in exploitable through the `#token=$ssid` hash when making a request to the `/verify` endpoint. An attacker team could potentially steal flags by, for example, explo
How urgent is CVE-2020-5290?
Priority 42/100. Public exploit reference