CVE-2026-45348 json
pyLoad: Stored XSS in Downloads view via unsanitized link URL in packages.js template literal
published 2026-05-14 5 mo ago modified 2026-07-13 3 mo ago also GHSA-fcjq-435v-jx94 , PYSEC-2026-2994 , EUVD-2026-32957
- cvss
- 8.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev100, the packages.js template at src/pyload/webui/app/themes/modern/templates/js/packages.js:172 interpolates a stored link URL into a template literal inside single-quoted HTML and then writes the result to the DOM via $(div).html(html). No escaping runs between the API value and innerHTML. An attacker (Alice) who can submit a package link puts a single quote plus event handler into the URL, breaks out of the attribute, and executes JavaScript in every operator's browser that opens the downloads view. The theme does not set a Content Security Policy that restricts inline script or event handlers. This vulnerability is fixed in 0.5.0b3.dev100.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/pyload/pyload/security/advisories/GHSA-fcjq-435v-jx94 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| GitHub | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
| OSV | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | pyload-ng | <=0.5.0b3.dev99 |
no fix listed |
Affected products
- pyload pyload
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/pyload/pyload/security/advisories/GHSA-fcjq-435v-jx94
exploit, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-45348
advisory
-
github.com
/pyload/pyload
package
-
pypi.org
/project/pyload-ng
package
-
github.com
/advisories/GHSA-fcjq-435v-jx94
advisory
Sources
- CVE List CVE-2026-45348
- GitHub Advisory GHSA-fcjq-435v-jx94
- NVD CVE-2026-45348
- OSV PYSEC-2026-2994
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.