CVE-2016-10516

Cross-site scripting (XSS) vulnerability in the render_full function in debug/tbtools.py in the debugger in Pallets Werkzeug before 0.11.11 (as used in Pallets Flask and other products) allows remote attackers to inject arbitrary web script or HTML via a field that contains an exception message.

Published: 2017-10-23 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-10516 is rated Moderate Risk (53.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.98%). EPSS rose +1.57% over the last day, indicating growing attacker interest. 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-2016-10516

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 2026-06-15 0.41% 1.98% +1.57%
2 2026-04-05 0.31% 0.41% +0.10%
3 2025-06-08 — 0.31% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-10516

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.0 MEDIUM
CVSS:3.0/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-2016-10516

GitHub Security Advisory for CVE-2016-10516

GHSA-h2fp-xgx6-xh6f · Severity: medium · Ecosystem: pip — Pallets Werkzeug cross-site scripting vulnerability

OS Trackers for CVE-2016-10516

vendor priority summary link
debian not yet assigned CVE-2016-10516 not yet assigned priority: Debian including 1 source packages (python-werkzeug), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-10516
redhat medium — https://access.redhat.com/security/cve/CVE-2016-10516
suse low CVE-2016-10516 severity low: SUSE including 3 source package names (python-Werkzeug, python2-Werkzeug, python3-Werkzeug), 69 product×package rows across 43 product lines (HPE Helion OpenStack 8, HPE Helion OpenStack Cloud 8, … (43 product lines)): Known Not Affected 69. https://www.suse.com/security/cve/CVE-2016-10516/
ubuntu medium CVE-2016-10516 medium priority: Ubuntu including 1 source packages (python-werkzeug), 5 status rows across 5 suites (artful, trusty, upstream, xenial, zesty): released 3, not-affected 2. https://ubuntu.com/security/CVE-2016-10516

Affected software / configurations for CVE-2016-10516

Vendor Product Version Raw CPE
palletsprojects werkzeug < 0.11.11 cpe:2.3:a:palletsprojects:werkzeug:*:*:*:*:*:*:*:*

References for CVE-2016-10516

cvelogic Threat Intelligence