CVE-2021-27938

A vulnerability has been identified in the Silverstripe CMS 3 and 4 version of the symbiote/silverstripe-queuedjobs module. A Cross Site Scripting vulnerability allows an attacker to inject an arbitrary payload in the CreateQueuedJobTask dev task via a specially crafted URL.

Published: 2021-03-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-27938 is rated Moderate Risk (40.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.24%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-27938

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-17 0.06% 0.24% +0.18%
2 2023-03-07 0.89% 0.06% -0.82%
3 2022-04-01 — 0.89% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27938

CVSS metrics for this CVE.

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]

Weakness enumeration for CVE-2021-27938

GitHub Security Advisory for CVE-2021-27938

GHSA-xgpf-p52j-pf7m · Severity: medium · Ecosystem: composer — XSS in CreateQueuedJobTask

Affected software / configurations for CVE-2021-27938

Vendor Product Version Raw CPE
symbiote silverstripe_queued_jobs >= 3.0.0, < 3.0.2 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 3.1.0, < 3.1.4 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 4.0.0, < 4.0.7 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 4.1.0, < 4.1.2 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 4.2.0, < 4.2.4 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 4.3.0, < 4.3.3 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 4.4.0, < 4.4.3 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 4.5.0, < 4.5.1 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*
symbiote silverstripe_queued_jobs >= 4.6.0, < 4.6.4 cpe:2.3:a:symbiote:silverstripe_queued_jobs:*:*:*:*:*:*:*:*

References for CVE-2021-27938

cvelogic Threat Intelligence