CVE-2021-36760 [Medium] | XSS in Api Manager

In accountrecoveryendpoint/recoverpassword.do in WSO2 Identity Server 5.7.0, it is possible to perform a DOM-Based XSS attack affecting the callback parameter modifying the URL that precedes the callback parameter. Once the username or password reset procedure is completed, the JavaScript code will be executed. (recoverpassword.do also has an open redirect issue for a similar reason.)

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-12-18	1.50%	0.67%	-0.83%
2	2025-11-21	1.28%	1.50%	+0.22%
3	2025-11-18	—	1.28%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-12-18

1.50%

0.67%

-0.83%

2025-11-21

1.28%

1.50%

+0.22%

2025-11-18

—

1.28%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	2.7	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

2.7

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

Affected software / configurations for CVE-2021-36760

Vendor	Product	Version	Raw CPE
wso2	api_manager	3.0.0	cpe:2.3:a:wso2:api_manager:3.0.0:::::::*
wso2	api_manager	3.1.0	cpe:2.3:a:wso2:api_manager:3.1.0:::::::*
wso2	api_manager	3.2.0	cpe:2.3:a:wso2:api_manager:3.2.0:::::::*
wso2	api_manager	4.0.0	cpe:2.3:a:wso2:api_manager:4.0.0:::::::*
wso2	identity_server	5.7.0	cpe:2.3:a:wso2:identity_server:5.7.0:::::::*
wso2	identity_server	5.8.0	cpe:2.3:a:wso2:identity_server:5.8.0:::::::*
wso2	identity_server	5.9.0	cpe:2.3:a:wso2:identity_server:5.9.0:::::::*
wso2	identity_server	5.10.0	cpe:2.3:a:wso2:identity_server:5.10.0:::::::*
wso2	identity_server	5.11.0	cpe:2.3:a:wso2:identity_server:5.11.0:::::::*
wso2	identity_server_as_key_manager	5.3.0	cpe:2.3:a:wso2:identity_server_as_key_manager:5.3.0:::::::*
wso2	identity_server_as_key_manager	5.5.0	cpe:2.3:a:wso2:identity_server_as_key_manager:5.5.0:::::::*
wso2	identity_server_as_key_manager	5.6.0	cpe:2.3:a:wso2:identity_server_as_key_manager:5.6.0:::::::*
wso2	identity_server_as_key_manager	5.7.0	cpe:2.3:a:wso2:identity_server_as_key_manager:5.7.0:::::::*
wso2	identity_server_as_key_manager	5.9.0	cpe:2.3:a:wso2:identity_server_as_key_manager:5.9.0:::::::*
wso2	identity_server_as_key_manager	5.10.0	cpe:2.3:a:wso2:identity_server_as_key_manager:5.10.0:::::::*
wso2	iot_server	3.3.1	cpe:2.3:a:wso2:iot_server:3.3.1:::::::*

References for CVE-2021-36760

URL	Tags
https://docs.wso2.com/display/Security/2021+Advisories	Vendor Advisory
https://docs.wso2.com/display/Security/Security+Advisory+WSO2-2021-1314	Vendor Advisory

URL

CVE-2021-36760

Exploit prediction scoring system (EPSS) score for CVE-2021-36760

Common vulnerability scoring system (CVSS) metrics for CVE-2021-36760

Weakness enumeration for CVE-2021-36760

Affected software / configurations for CVE-2021-36760

References for CVE-2021-36760