CVE-2021-3780
Cross-site Scripting (XSS) - Stored in chocobozzz/peertube
peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Cross-site Scripting (XSS) - Stored in chocobozzz/peertube
peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Record
CVE-2021-3780- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2021-2045
peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Record
EUVD-2021-2045- CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-f2c5-997w-7f5c
Cross-site Scripting in peertube
peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). It was found that one could upload a SVG image and then send the url of that to other users and when they open the link we can get their complete session keys as the session keys stored in local storage and with Javascript easily can be stolen by attackers.
- Record
GHSA-f2c5-997w-7f5c- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Record
CVE-2021-3780- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 3.0
- 7.6 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- Record
CVE-2021-3780- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-f2c5-997w-7f5c
Cross-site Scripting in peertube
peertube is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). It was found that one could upload a SVG image and then send the url of that to other users and when they open the link we can get their complete session keys as the session keys stored in local storage and with Javascript easily can be stolen by attackers.
- Record
GHSA-f2c5-997w-7f5c- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
peertubenpm |
before 3.4.0 | 3.4.0 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-3780 is a high vulnerability (CVSS 7.6) in Chocobozzz Chocobozzz/peertube, published September 15, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.90%, the 59th percentile. Fixed in peertube 3.4.0.