A recent incident has revealed that achievement information for games that have not yet been released—or even officially announced—has been unintentionally exposed on public achievement‑tracking services such as Exophase and SteamDB. Among the titles whose achievement lists appeared were highly anticipated projects like the next installment of the Fable series, Persona 6, Kingdom Hearts 4, and the upcoming Control: Resonant expansion. The problem appears to stem from a bug introduced by Valve during its routine weekly maintenance window. Simon Carless, the founder of GameDiscoverCo, explained that Valve "unfortunately rolled out a major bug around achievements" after this scheduled maintenance.
Because of the flaw, any automated system that queries Steam’s achievement API now receives data for every game that has an achievement structure attached to it, regardless of whether the game is publicly visible, still in development, or has not yet been announced to the community. Carless elaborated, "As a result, automated data collectors of Steam achievement info such as Exophase and SteamDB are collecting achievement data for every single Steam game that has one, even those unreleased...
or even unannounced." In other words, the bug bypasses the privacy safeguards that normally keep unreleased titles hidden, allowing third‑party sites to scrape and display achievement tables that were meant to remain inaccessible until the developers decide to make them public. Mike Bendel, the owner of Exophase, responded to inquiries by clarifying that the situation is not a deliberate data leak on the part of Valve but rather an unintended side effect of the platform’s own error. In a discussion on the ResetEra forum, Bendel wrote, "a bunch of games with achievements that should be private are accessible through API right now and that's why they got scanned into the site." He added that his service typically does not encounter entries for games without a proper title; however, during the brief window when the bug was active, the system began logging entries that were identified only by their numeric AppID because no public name existed yet.
The scope of the issue extends beyond the headline‑grabbing titles. According to coverage by Gematsu, a variety of other projects were also caught in the sweep, including "Gears of War: E‑Day," the upcoming multiplayer title "Clutch," the action‑RPG "Horizon Hunters Gathering," "Ace Combat 8," the futuristic shooter "Metro 2039," the arcade‑style racer "Star Wars: Galactic Racer," the indie adventure "Stranger Than Heaven," a reimagined version of "Rayman Legends: Retold," and a new "Tomb Raider" entry dubbed "Legacy of Atlantis." Each of these games had achievement data temporarily visible on the public trackers, despite many of them being in early development phases or even kept under wraps by their publishers. GamesIndustry.biz has reached out to Valve for an official comment and further details about the bug’s cause, its duration, and any steps being taken to remediate the exposure. While Valve has not yet issued a comprehensive public statement regarding this specific achievement‑data incident, the company’s history with security and privacy concerns provides some context.
In July of the same year, Valve confirmed that personal information belonging to European customers had been compromised as a result of a breach at CEVA Logistics, the regional shipping partner responsible for delivering Steam hardware. The breach, which occurred between July 29 and August 1, was discovered by Valve on August 7, prompting the company to notify affected users and cooperate with authorities.
The recent achievement‑data glitch highlights the broader challenges of balancing openness with confidentiality on large digital distribution platforms. Steam’s API is designed to allow developers and third‑party services to enrich the gaming experience by providing real‑time statistics, leaderboards, and achievement tracking. However, when a systemic error occurs, the same openness can become a conduit for unintended disclosure of sensitive information, such as unreleased content, narrative spoilers, or even strategic development roadmaps. From a technical standpoint, the bug likely involved a failure to properly filter out entries marked as "private" or "hidden" during the data extraction routine that runs after each maintenance cycle.
When the filter malfunctioned, the API responded with a full list of achievement definitions for every app that had any achievement metadata attached, regardless of its visibility status. Automated crawlers, which regularly poll the API to keep their databases up to date, then ingested this data and displayed it on their public sites. In response to the incident, industry observers recommend that Valve implement more granular permission checks and introduce a delay or manual review step before exposing achievement data for titles that have not yet been officially launched.
Developers may also consider using placeholder achievements or disabling the achievement system entirely until a game reaches a certain milestone, thereby reducing the risk of premature exposure. For players and fans who stumbled upon these hidden achievement lists, the experience can be a double‑edged sword. On one hand, it offers a tantalizing glimpse into upcoming games, fueling speculation and excitement. On the other hand, it can spoil narrative elements, spoil surprise announcements, or create misinformation if the data is misinterpreted.
Communities such as ResetEra, Reddit, and various gaming news outlets have already begun dissecting the leaked tables, attempting to infer game mechanics, story beats, and even release timelines based on the names and quantities of the achievements. Valve’s next steps will be closely watched. The company is expected to patch the API, purge the inadvertently exposed data from third‑party sites where possible, and perhaps issue an apology to both developers and the broader gaming community. In the meantime, the incident serves as a reminder that even well‑established platforms can encounter unforeseen glitches that ripple across the ecosystem, underscoring the importance of robust testing, transparent communication, and swift remediation when privacy breaches—intentional or accidental—occur.