Grav versions from 1.5.2 through 2.0.12 contain a stored cross-site scripting vulnerability in the Security::detectXss() function (system/src/Grav/Common/Security.php). The event-handler scan is anchored at `<` and uses `[^>]*?`, which cannot cross the first literal `>`; when a `>` appears inside a quoted attribute value the browser keeps the tag open and parses a subsequent event handler (e.g. onerror), so the detector and browser disagree. A page editor without admin.super privileges can save page content such as `<img src=x title=">" onerror=alert(document.domain)>`, which is accepted, stored, and executed in the site origin when any visitor (including unauthenticated users) views the page.
Fixed in 2.0.13.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 20
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:1.5.2:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.10:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.9:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.8:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.7:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.6:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.5:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:1.7.53.2:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:1.7.53.1:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.4:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.3:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.2:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.1:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.0:-:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.0:rc10:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.0:rc9:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:1.7.53:*:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.0:rc8:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.0:rc7:*:*:*:*:*:*
|
— | — |
|
Getgrav Grav
cpe:2.3:a:getgrav:grav:2.0.0:rc6:*:*:*:*:*:*
|
— | — |
References 3
https://github.com/getgrav/grav/commit/ad9709f865b09b68798fb1ac375b484a8cc1d892
disclosure@vulncheck.com
https://github.com/getgrav/grav/security/advisories/GHSA-269c-h76q-8cxw
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/grav-before-stored-xss-via-quoted-attribut…
disclosure@vulncheck.com