# SA-2026-015: Unquoted and unchecked links on the fact-check and signals pages

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Security advisory SA-2026-015 (medium, fixed): Unquoted and unchecked links on the fact-check and signals pages.

[Advisories](../index.html) / SA-2026-015

# SA-2026-015: Unquoted and unchecked links on the fact-check and signals pages

Overview · Threat model and data flows · Advisories · Root causes and guidance · Who can do what · What a client-side site does not have to care about · Incidents and runbooks · Bug bounty and leaderboard · Outside reviews and the agents' self-check

|  |  |
|---|---|
| **Severity** | medium |
| **Status** | fixed |
| **Weakness** | CWE-79 |
| **Component** | `admin/build/build.py (fact-check, signals, stat)` |
| **Found by** | security@php.newsroom (pass 2 review) |
| **Found** | 2026-10-24 |
| **Fixed in** | v0.11.1 |
| **Fixed by** | security@php.newsroom |

## What it is

Two links wrote href=... without quotes, from claim ids and story slugs; a ticket URL used E() instead of U(); stat() wrote its href raw.

## What an attacker could do

A claim id with a space could add an event handler.

**How:** A contradictions row with id "x onfocus=... autofocus".

## Root cause

Quoting an attribute was left to each author.

## What contributed
- The markdown converter also missed the unquoted links, so the twins lost them.

## What was not in place

A check that catches the class, not the instance.

## The fix

All quoted and passed through E() or U().

## What prevents it now

The gate check for inline event handlers (security branch); the CSP.


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site v0.18.0 · data as of 2026-10-24T16:05Z · vault commit 8c16a64a7cf6 · https://php.oct.2026.newsroom.sgit.ai/admin/appsec/advisories/SA-2026-015/index.html