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CVE-2021-31537

32
FAUCET Score

CVE-2021-31537 describes a Cross-Site Scripting (XSS) vulnerability in SIS Informatik SIS-REWE Go versions prior to 7.7 SP17, specifically affecting the rewe/prod/web/index.php and /rewe/prod/web/rewe_go_check.php scripts through various parameters. With a CVSS score of 6.1 (Medium), this vulnerability has a network-based attack vector and low attack complexity, potentially leading to limited impact on confidentiality and integrity if a user interacts with a malicious link. While there is no evidence of active exploitation or public exploit code beyond a Nuclei template, its high EPSS score and FAUCET Risk Score indicate a significant potential for future exploitation. Community discussion and media coverage for this CVE are currently minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 7.7CPE matchmatch criteria
cpe:2.3:a:sisinformatik:sis-rewe_go:*:*:*:*:*:*:*:*
7.7CPE matchmatch criteria
cpe:2.3:a:sisinformatik:sis-rewe_go:7.7:-:*:*:*:*:*:*
7.7CPE matchmatch criteria
cpe:2.3:a:sisinformatik:sis-rewe_go:7.7:sp16:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
7.78%
Probability of exploitation in next 30 days
EPSS Percentile
94.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
Nuclei: CVE-2021-31537 · May 12, 2021
This CVE's current EPSS score of 0.0778 is in the 97th percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

seclists.org / fulldisclosure/2021/May/20
ExploitMailing ListThird Party Advisory
sec-consult.com / vulnerability-lab/advisory/reflected-xss-sis-infromatik-rewe-go-cve-2021-31537
ExploitThird Party Advisory
sisinformatik.com / rewe-go
Vendor Advisory